van norden dam public meeting 7-29-13
TRANSCRIPT
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Lake Van Norden Dam Truckee Donner Land Trust Public Meeting
David Shaw, Brian Hastings,
Ted Beedy, Barry Anderson
July 29, 2013
photo
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Acknowledgements
• Chuck Kull, Holdrege and Kull
• Randy Westmoreland, USFS
• Gateway Mountain Center
• Norm Sayler
• Susan Lindstrom, PhD
• UC Davis Center for Watershed Science
• Aspet Ordoubigian, DSOD
• George Lamson
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Overview
• Planning and regulatory framework• Approach• Sierra meadows overview• Historical context• Summary of preliminary findings
– Channel and meadow conditions– Plants– Wildlife– Bathymetry
• Description of alternatives• Next steps
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Regulatory Framework
1. < 50 acre feet
-OR-
2. < 6 feet high
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Regulatory Framework
Plants
USFS Manual 7500: Dam Planning, Investigation and Design
• Alternative 1: Full Breach
• Alternative 2: “Non-jurisdictional” dam with determination of hazard
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Regulatory Framework
Plants
USFS Manual 7500: Dam Planning, Investigation and Design
• Alternative 3 (?): Existing dam with acceptable level of risk with dam failure
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Investigation Approach
Goal:
Document existing conditions so that impacts associated with various alternatives can be evaluated and monitored
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Investigation Approach
Study Elements:
• Historical and Cultural Resources Assessment• Channel and Meadow Assessment• Biological Resources Assessment• Bathymetric Survey
Next steps:
• Complete Channel and Meadow Assessment• Hydrology and Hydraulics Hazards• Monitor surface-groundwater interactions• Evaluation of Alternatives
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Sierra Meadows Overview
HydroGeomorphic Meadow Types
(after Weixelman and others 2011)
• Peatland
• Depressional
• Lacustrine
• Dry
• Discharge Slope
• Riparian
• Subsurface
HydroGeomorphic Wetland Types
(after USACE 1993, NRCS, 2008)
• Depressional
• Slope
• Mineral Soil Flats
• Organic Soil Flats
• Riverine
• Lacustrine Fringe
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Historical and Culture Events Lake Van Norden and Meadow
Date Event
9,000 yrs ago to historic contact Prehistory and Washoe/Maidu history
1844-1852 Emigrant Trail
1864 Dutch Flat Donner Lake Wagon Road
1868-69 Transcontinental Railroad
1870s-1880s Initial dam construction by S. Yuba Canal Co.
ca. 1908 Dam construction by PG&E
1913-1925 Lincoln Highway
1921-1927 Victory Highway
1956-present Old County Road
late 1970s Draw-down of Lake Van Norden
2012 Land acquired by Truckee Donner Land Trust
2013 Lake Van Norden and Meadow Assessment
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Van Norden Meadow
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HGM Map (UCD)
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Van Norden Meadow
Review of Historical Aerial Photography: 6-11-20118-21-20058-7-19929-6-19838-31-19777-24-19738-2-19727-15-19666-27-1939
Review of Historical Maps: GLO 1866County Maps 1887, 1890, 1913USGS 1889, 1940, 1955 (photo revised 1979)TNF 1911
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Channel Conditions Van Norden Watershed and Meadow
Watershed Area: 10.4 sq. mi.
Headwaters of:
• South Fork Yuba River
Tributaries:
• Upper Castle Creek
• “Lytton Creek”
Geology:
• Cretaceous crystalline rocks
• Tertiary extrusive volcanics
• Glaciated
Current Land Uses:
Interstate I-80, Ski Areas, UPRR
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Channel Conditions Upper Castle Creek
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Channel Conditions South Fork Yuba River
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Habitat Lake Van Norden and Meadow
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Special Status Species:Bog and Fen species, Botrychium and Sphagnum
VegetationVan Norden Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Bird Species Present Lake Van Norden and Meadow
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Other WildlifeInvertebrates, Reptiles, Amphibians, Mammals
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BathymetryExisting Conditions
50 acre-foot lake mapStorage volume = 190 ac-ft
Surface area = 86.7 ac
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Bathymetry50 ac-ft Lake Volume Footprint
4-foot notch lake mapReq’d notch depth = 2.2 feet
Surface area = 30.8 acres
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Bathymetry4-ft Notched Lake Volume Footprint
4-foot notch lake mapStorage volume = 13.2 ac-ft
Surface area = 11.8 ac
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Evaluation of alternatives
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Evaluation of alternativesAerial photography evaluation and interpretation
1966
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Evaluation of alternativesAerial photography evaluation and interpretation
1977
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Evaluation of alternativesAerial photography evaluation and interpretation
2011
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Discussion